dt: Document general interrupt controller bindings
In order to use a device as interrupt controller, it needs to be marked with the DT interrupt-controller property. This commit adds rudimentary documentation about the required standard properties and describes the most commonly used interrupt specifiers. Cc: Linus Walleij <linus.walleij@stericsson.com> Cc: Grant Likely <grant.likely@secretlab.ca> Acked-by:Stephen Warren <swarren@wwwdotorg.org> Cc: devicetree-discuss@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Signed-off-by:
Thierry Reding <thierry.reding@avionic-design.de> Signed-off-by:
Rob Herring <rob.herring@calxeda.com>
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